div{
    width: 100px;
    height: 100px;
    margin: 10px;
}

div:nth-child(1){
    border: 5px solid green;
}

div:nth-child(2){
    border: 5px double green;
}

div:nth-child(3){
    border: 5px dashed green;
}

div:nth-child(4){
    border: 5px dotted green;
}

div:nth-child(5){
    border: 20px groove green;
}

div:nth-child(6){
    border: 20px ridge green;
}

div:nth-child(7){
    border: 20px inset green;
}

div:nth-child(8){
    border: 20px outset green;
}